package com.socialuni.sdk.utils;

import org.springframework.util.ObjectUtils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class IpUtil {
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress;
        String os = System.getProperty("os.name");
        if (os.toLowerCase().startsWith("win")) {  //如果是Windows系统
            ipAddress = "123.119.137.133";
        } else {
            try {
                ipAddress = request.getHeader("x-forwarded-for");
                if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                    ipAddress = request.getHeader("Proxy-Client-IP");
                }
                if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                    ipAddress = request.getHeader("WL-Proxy-Client-IP");
                }
                if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                    ipAddress = request.getRemoteAddr();
                    if (ipAddress.equals("127.0.0.1")) {
                        // 根据网卡取本机配置的IP
                        InetAddress localIp = null;
                        try {
                            localIp = InetAddress.getLocalHost();
                        } catch (UnknownHostException e) {
                            e.printStackTrace();
                        }
                        if (!ObjectUtils.isEmpty(localIp)) {
                            ipAddress = localIp.getHostAddress();
                        }
                    }
                }
                // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
                if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
                    // = 15
                    if (ipAddress.indexOf(",") > 0) {
                        ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                    }
                }
            } catch (Exception e) {
                ipAddress = "";
            }
        }
        // ipAddress = this.getRequest().getRemoteAddr();
        return ipAddress;
    }
}